One of Netflix’s biggest sci-fi shows (and biggest shows, period) is winding to a close. Netflix has renewed Lost in Space for a third and final season expected to premiere sometime in 2021. This isn’t the product of Netflix’s habit of canceling shows after three seasons, thankfully. Series showrunner Zack Estrin stressed that the modernized tale of the Robinsons and the Robot was designed as a trilogy with a “clear beginning, middle and end,” and it’s just reaching its expected conclusion.